When will the speed limits change?

Expect the new speed limits to take effect "sometime this spring," said Scott Manning, an spokesman for Indiana's transportation department.

"We don’t have an exact date for when these changes will take effect. INDOT is currently doing an inventory of all of the speed limit and speed advisory signs that will need to be updated along the routes," Manning said. "Once that’s complete, a sign shop will need to produce new signs."

Manning reminded drivers that until the speed limits change, "the posted speed limits remain in effect (and) will continue to be enforced."

Why are speed limits increasing?

As Indiana's transportation department makes improvements to roads around the state, traffic engineers evaluate how the improvements impact "traffic volumes and conditions so that speed limits can be" set appropriately, Manning said.

"We have engineering guidelines we follow on determining speed limits that consider highway design, urban vs. rural, traffic volumes, spacing of interchanges, number of travel lanes and other factors," Manning said in an email. "We also work closely with law enforcement to factor in their feedback on safety and enforcement before making any changes."

For 2018, Sgt. Carey Huls, an Indiana State Police spokesman, said troopers wrote over 7,000 speeding citations in the 55 mph zone of I-65 and I-265 in Clark County.